Determining the nature of the active sites of Cu-beta zeolites for the selective catalytic reduction (SGR) of NOx by using a coupled reaction XAES/XPS study

被引:82
作者
Corma, A
Palomares, A
Marquez, F
机构
[1] Instituto de Tecnología Química, Universidad Politécnica de Valencia, C.S.I.C., 46071 Valencia, Av. de los Naranjos s/n
关键词
D O I
10.1006/jcat.1997.1739
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The present work reports a XPS and XAES study of Cu-Beta zeolites with different Cu loadings, coupled with an in situ type of catalytic experiments conducted in a high-pressure gas cell installed in the preparation chamber of the spectrometer, It has been found that the most active Cu-Beta zeolites for SCR of NOx are those in which the conversion between Cu+2 and Cu+1 species is quickly produced under reaction conditions, This conversion between both oxidation states is easier in over-exchanged Cu-Beta samples. When exposed to the reaction conditions, the over-exchanged Cu-Beta zeolites show a high level of dispersed Cu+1 species, and a correlation between the ratio of Cu+1 to total Cu on the surface in the working catalyst and catalytic activity has been found. (C) 1997 Academic Press.
引用
收藏
页码:132 / 139
页数:8
相关论文
共 31 条
[1]   XPS SURFACE CHARACTERIZATION OF A CU/SIO2 CATALYST OXIDIZED BY NO OR O2 [J].
BALKENENDE, AR ;
VANKOOTEN, WEJ ;
PIETERS, AR ;
LAMERS, M ;
JANSSEN, FJJG ;
GEUS, JW .
APPLIED SURFACE SCIENCE, 1993, 68 (03) :439-444
[2]  
BRIGGS D, 1994, PRACTICAL SURFACE AN
[3]   Selective catalytic reduction of NOx on Cu-beta zeolites [J].
Corma, A ;
Fornes, V ;
Palomares, E .
APPLIED CATALYSIS B-ENVIRONMENTAL, 1997, 11 (02) :233-242
[4]   Effect of pretreatments in various atmospheres on the transient DeNO(x) activity of a Cu-MFI catalyst [J].
Gaudin, C ;
Duprez, D ;
Mabilon, G ;
Prigent, M .
JOURNAL OF CATALYSIS, 1996, 160 (01) :10-18
[5]  
GENTI G, 1992, RES CHEM INTERMEDIAT, V17, P125
[6]   THE INTERACTION OF NO WITH COPPER IONS IN ZSM5 - AN EPR AND IR INVESTIGATION [J].
GIAMELLO, E ;
MURPHY, D ;
MAGNACCA, G ;
MORTERRA, C ;
SHIOYA, Y ;
NOMURA, T ;
ANPO, M .
JOURNAL OF CATALYSIS, 1992, 136 (02) :510-520
[7]  
GRUNERT W, 1994, J PHYS CHEM-US, V98, P10832
[8]   XANES AND EXAFS ANALYSIS OF COPPER ION-EXCHANGED ZSM-5 ZEOLITE CATALYST USED FOR NITROGEN MONOXIDE DECOMPOSITION [J].
HAMADA, H ;
MATSUBAYASHI, N ;
SHIMADA, H ;
KINTAICHI, Y ;
ITO, T ;
NISHIJIMA, A .
CATALYSIS LETTERS, 1990, 5 (02) :189-196
[9]   FORMATION, STORAGE AND REACTIVITY OF NITRILE SPECIES DURING THE LEAN NOX REACTION OVER CU/ZSM-5 CATALYSTS [J].
HAYES, NW ;
GRUNERT, W ;
HUTCHINGS, GJ ;
JOYNER, RW ;
SHPIRO, ES .
JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS, 1994, (04) :531-532
[10]  
HELD W, 1987, Patent No. 3642018